What happened to the unstable engine speed of Jetta King V5 1.6?

There are many reasons for unstable idle speed. First, the throttle of your car is too dirty. It hasn't been cleaned for a long time and needs cleaning. Computer matching is required after cleaning. The matching code is 098. Second, the throttle has not been matched by computer after cleaning, so it needs to be matched by computer decoder in the repair shop. Third, it is possible that the throttle valve will be cracked after being used for a long time, and it is necessary to replace the throttle valve. It is recommended to clean first, and then mix them to see the effect. If not, consider replacing it. I can safely tell you that the problem with your car is the accelerator, which can be basically eliminated by the method I told you. Five-valve car has a long service life, and unstable idle speed is common, which is basically caused by the above situation.